According to the O-RAN-SC-OAM-Architecture document, all ManagedElements (near-real-time-RIC, O-CU-CP, O-CU-UP, O-DU and O-RU) implement the O1-interface.
The O-RAN-OAM-interface specification defines
a NetConf-Server for Configuration Management (CM) and
a http-client for Fault Managment (FM), Performance Management (PM) and other events
on each Management-Service-Provider (MnS-Provider) running on the ManagedElement (ME).
The O-RAN-SC-OAM project provides reference implementation according to the O-RAN OAM (WG1) documents. In addition we provide a common MnS-Consumer for development and module test purposes. The assumption is that the projects for the ManagedElements can concentrate on the more important user-plane.
Of course each project needs its own OAM repo to address the specific needs of the ManagedElement.